Be logged in, go to settings (see the link), scroll down for the deletion link and use it.
URLS:
http://www.vimeo.com
https://vimeo.com/settings
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.